def _convert_state_v37_dict_to_v38_dict(cls, question_state_dict):
"""Converts from version 37 to 38. Version 38 adds a customization arg
for the Math interactions that allows creators to specify the letters
that would be displayed to the learner.
Args:
question_state_dict: dict. A dict where each key-value pair
represents respectively, a state name and a dict used to
initialize a State domain object.
Returns:
dict. The converted question_state_dict.
"""
if question_state_dict['interaction']['id'] in (
'AlgebraicExpressionInput', 'MathEquationInput'):
variables = set()
for group in question_state_dict[
'interaction']['answer_groups']:
for rule_spec in group['rule_specs']:
rule_input = rule_spec['inputs']['x']
for variable in expression_parser.get_variables(
rule_input):
# Replacing greek letter names with greek symbols.
if len(variable) > 1:
variable = (
constants.GREEK_LETTER_NAMES_TO_SYMBOLS[
variable])
variables.add(variable)
customization_args = question_state_dict[
'interaction']['customization_args']
customization_args.update({
'customOskLetters': {
'value': sorted(variables)
}
})
return question_state_dict
def test_get_variables(self):
"""Tests for get_variables method."""
self.assertItemsEqual(expression_parser.get_variables('a^2.3'), ['a'])
self.assertItemsEqual(
expression_parser.get_variables('abs(alpha)'), ['alpha'])
self.assertItemsEqual(
expression_parser.get_variables('alpha/gamma'), ['alpha', 'gamma'])
self.assertEqual(expression_parser.get_variables('A + 2/3'), ['A'])
self.assertItemsEqual(
expression_parser.get_variables('alphabetagamma'),
['alpha', 'beta', 'gamma'])
self.assertItemsEqual(
expression_parser.get_variables('betalphaa'),
['a', 'p', 'beta', 'l', 'h'])
self.assertItemsEqual(
expression_parser.get_variables('a+a*a/aa^a-a'), ['a'])
self.assertItemsEqual(expression_parser.get_variables(
'sqrt(3+x^y)/abs(gamma)'), ['y', 'x', 'gamma'])
self.assertItemsEqual(
expression_parser.get_variables('a=3+4'), ['a'])
self.assertItemsEqual(expression_parser.get_variables(
'(a-2)^beta = alpha/gamma'), ['a', 'alpha', 'beta', 'gamma'])
self.assertItemsEqual(
expression_parser.get_variables('4=abs(-4)'), [])
self.assertItemsEqual(
expression_parser.get_variables('a^pi + e/2'), ['a', 'pi', 'e'])
self.assertItemsEqual(
expression_parser.get_variables('pi-3.14e'), ['pi', 'e'])
self.assertItemsEqual(
expression_parser.get_variables('epi'), ['pi', 'e'])